Salary in India is a wide spectrum. At the top end of the talent pool, it is indeed reaching West European levels. I know because I managed a team that was in Spain and India.

However now I run my second startup (bootstrapped) where I hire, train and generate value from candidates who are at the other end of the spectrum with monthly salaries much lower than what is quoted in the article.

It is a very wide spectrum for tech salaries here in India.